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Seeking in lavc somewhat almost works

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Originally committed to SVN as r145.
This commit is contained in:
Rodrigo Braz Monteiro 2006-02-24 06:34:35 +00:00
parent ddc7c8b323
commit d05e857115
2 changed files with 25 additions and 5 deletions
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29
core/video_provider_lavc.cpp
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@ -171,6 +171,9 @@ void LAVCVideoProvider::GetNextFrame() {
// Success?
if(frameFinished) {
// Set time
lastDecodeTime = packet.dts;
// Free packet
av_free_packet(&packet);
return;
@ -223,13 +226,29 @@ wxBitmap LAVCVideoProvider::GetFrame(int n) {
n = MID(0,n,GetFrameCount()-1);
if (n == frameNumber) return curFrame;
// Seek if needed
if (n != frameNumber+1) {
av_seek_frame(formatContext,vidStream,n,0);
// Following frame, just get it
if (n == frameNumber+1) {
GetNextFrame();
}
// Get frame
GetNextFrame();
// Needs to seek
else {
// Get seek position
__int64 half = __int64(AV_TIME_BASE) * stream->r_frame_rate.den / stream->r_frame_rate.num / 2;
__int64 seekTo = __int64(n) * AV_TIME_BASE * stream->r_frame_rate.den / stream->r_frame_rate.num + stream->start_time;
if (seekTo > half) seekTo -= half;
else seekTo = 0;
__int64 finalPos = av_rescale(seekTo,stream->time_base.den,AV_TIME_BASE * __int64(stream->time_base.num));
// Seek to keyframe
int result = av_seek_frame(formatContext,vidStream,finalPos,0);
// Seek until final frame
GetNextFrame();
while (lastDecodeTime < n) {
GetNextFrame();
}
}
// Bitmap
wxBitmap bmp;

1
core/video_provider_lavc.h
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@ -56,6 +56,7 @@ private:
AVFrame *frame;
int vidStream;
__int64 lastDecodeTime;
int frameNumber;
wxBitmap curFrame;